Alien Syndrome - help?

Have had my Wii for about 2 weeks now. It came with Alien Syndrome. Played it once now, and really think I am missing something, or the game is missing something. I am sure this game has more to it, and maybe I don't see what.

I played it till I got the keycard at the beginning, then went through a door and had to kill about 100 worm monsters, and other monsters.

Can someone please give me a detailed walkthrough the beggining of the game, because I really can't get the hang of it. Or show me a site with a walkthrough. I really need help.

I've been playing too much of Mario and Sonic at the Olympic Games and I think I need to play a much more relaxing game now.